Add basic support for prerelease versions

ApplicationUpdate.sln.DotSettings

@@ -0,0 +1,2 @@
+<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Kaczor/@EntryIndexedValue">True</s:Boolean></wpf:ResourceDictionary>

GitHubRelease.cs

@@ -1,30 +1,84 @@
 using Newtonsoft.Json;
 using Newtonsoft.Json.Converters;
 using System.Globalization;
+using System.Net.Http.Headers;
+using System.Text.RegularExpressions;
 
 namespace ChrisKaczor.ApplicationUpdate
 {
     public partial class GitHubRelease
     {
-        [JsonProperty("tag_name")]
-        public string? TagName { get; set; }
+        private const string LatestSegment = "/latest";
 
-        [JsonProperty("assets")]
-        public List<Asset>? Assets { get; set; }
+        private static readonly HttpClient HttpClient = new()
+        {
+            DefaultRequestHeaders =
+                { UserAgent = { ProductInfoHeaderValue.Parse(UpdateCheck.ApplicationName.Replace(" ", "")) } }
+        };
+
+        private static GitHubRelease? FromJson(string json) =>
+            JsonConvert.DeserializeObject<GitHubRelease>(json, Converter.Settings);
+
+        private static List<GitHubRelease>? FromJsonArray(string json) =>
+            JsonConvert.DeserializeObject<List<GitHubRelease>>(json, Converter.Settings);
+
+        [JsonProperty("tag_name")] public string? TagName { get; set; }
+
+        [JsonProperty("assets")] public List<Asset>? Assets { get; set; }
+
+        [JsonProperty("prerelease")] public bool Prerelease { get; set; }
+
+        public static async Task<VersionInfo?> GetLatestAsync(string baseUrl)
+        {
+            try
+            {
+                var url = baseUrl.EndsWith(LatestSegment) ? baseUrl : baseUrl + LatestSegment;
+
+                var json = await HttpClient.GetStringAsync(url);
+
+                var release = FromJson(json);
+
+                var versionInfo = VersionInfo.CreateFromGitHubRelease(release);
+
+                return versionInfo;
+            }
+            catch (Exception)
+            {
+                return null;
+            }
+        }
+
+        public static async Task<VersionInfo?> GetLatestPrereleaseAsync(string baseUrl)
+        {
+            try
+            {
+                var url = baseUrl.EndsWith(LatestSegment) ? baseUrl[..^LatestSegment.Length] : baseUrl;
+
+                var json = await HttpClient.GetStringAsync(url);
+
+                var releases = FromJsonArray(json);
+
+                var release = releases?.FirstOrDefault();
+
+                if (release == null)
+                    return null;
+
+                var versionInfo = VersionInfo.CreateFromGitHubRelease(release);
+
+                return versionInfo;
+            }
+            catch (Exception)
+            {
+                return null;
+            }
+        }
     }
 
     public class Asset
     {
-        [JsonProperty("created_at")]
-        public DateTimeOffset? CreatedAt { get; set; }
+        [JsonProperty("created_at")] public DateTimeOffset? CreatedAt { get; set; }
 
-        [JsonProperty("browser_download_url")]
-        public string? BrowserDownloadUrl { get; set; }
-    }
-
-    public partial class GitHubRelease
-    {
-        public static GitHubRelease? FromJson(string json) => JsonConvert.DeserializeObject<GitHubRelease>(json, Converter.Settings);
+        [JsonProperty("browser_download_url")] public string? BrowserDownloadUrl { get; set; }
     }
 
     internal class Converter

UpdateCheck.cs

@@ -45,9 +45,9 @@ public static class UpdateCheck
         ApplicationUpdateMessage = applicationUpdateMessageDelegate;
     }
 
-    public static async Task<bool> CheckForUpdate()
+    public static async Task<bool> CheckForUpdate(bool includePrerelease)
     {
-        RemoteVersion = await VersionInfo.Load(UpdateServerType, UpdateServer, UpdateFile);
+        RemoteVersion = await VersionInfo.Load(UpdateServerType, UpdateServer, UpdateFile, includePrerelease);
 
         if (RemoteVersion == null)
             return false;
@@ -98,9 +98,9 @@ public static class UpdateCheck
         return true;
     }
 
-    public static async void DisplayUpdateInformation(bool showIfCurrent)
+    public static async Task DisplayUpdateInformation(bool showIfCurrent, bool includePrerelease)
     {
-        await CheckForUpdate();
+        await CheckForUpdate(includePrerelease);
 
         // Check for an update
         if (UpdateAvailable)

VersionInfo.cs

@@ -1,28 +1,35 @@
-using System.Xml.Linq;
+using System.Net.Http.Headers;
+using System.Xml.Linq;
 
 namespace ChrisKaczor.ApplicationUpdate;
 
 public class VersionInfo
 {
+    private static readonly HttpClient HttpClient = new() { DefaultRequestHeaders = { UserAgent = { ProductInfoHeaderValue.Parse(UpdateCheck.ApplicationName) } } };
+
     public Version? Version { get; set; }
     public string? InstallFile { get; set; }
     public DateTimeOffset? InstallCreated { get; set; }
+    public bool? Prerelease { get; set; }
 
-    public static async Task<VersionInfo?> Load(ServerType updateServerType, string server, string file)
+    public static async Task<VersionInfo?> Load(ServerType updateServerType, string url, string file, bool includePrerelease)
     {
         return updateServerType switch
         {
-            ServerType.Generic => LoadFile(server, file),
-            ServerType.GitHub => await LoadGitHub(server),
+            ServerType.Generic => LoadFile(url, file, includePrerelease),
+            ServerType.GitHub => await LoadGitHub(url, includePrerelease),
             _ => null
         };
     }
 
-    private static VersionInfo? LoadFile(string server, string file)
+    private static VersionInfo? LoadFile(string url, string file, bool includePrerelease)
     {
         try
         {
-            var document = XDocument.Load(server + file);
+            if (includePrerelease)
+                throw new NotSupportedException("Prerelease not currently supported for generic server type");
+
+            var document = XDocument.Load(url + file);
 
             var versionInformationElement = document.Element("versionInformation");
 
@@ -51,33 +58,26 @@ public class VersionInfo
         }
     }
 
-    private static async Task<VersionInfo?> LoadGitHub(string server)
+    private static async Task<VersionInfo?> LoadGitHub(string baseUrl, bool includePrerelease)
     {
-        try
-        {
-            var httpClient = new HttpClient();
+        var versionInfo = includePrerelease ? await GitHubRelease.GetLatestPrereleaseAsync(baseUrl) : await GitHubRelease.GetLatestAsync(baseUrl);
+        
+        return versionInfo;
+    }
 
-            httpClient.DefaultRequestHeaders.UserAgent.ParseAdd(UpdateCheck.ApplicationName);
-
-            var json = await httpClient.GetStringAsync(server);
-
-            var release = GitHubRelease.FromJson(json);
-
-            if (release?.TagName == null || release.Assets == null || release.Assets.Count == 0)
-                return null;
-
-            var versionInfo = new VersionInfo
-            {
-                Version = Version.Parse(release.TagName),
-                InstallFile = release.Assets[0].BrowserDownloadUrl,
-                InstallCreated = release.Assets[0].CreatedAt?.UtcDateTime
-            };
-
-            return versionInfo;
-        }
-        catch (Exception)
-        {
+    internal static VersionInfo? CreateFromGitHubRelease(GitHubRelease? release)
+    {
+        if (release?.TagName == null || release.Assets == null || release.Assets.Count == 0)
             return null;
-        }
+
+        var versionInfo = new VersionInfo
+        {
+            Version = Version.Parse(release.TagName),
+            InstallFile = release.Assets[0].BrowserDownloadUrl,
+            InstallCreated = release.Assets[0].CreatedAt?.UtcDateTime,
+            Prerelease = release.Prerelease
+        };
+
+        return versionInfo;
     }
 }